socalred Posted December 7, 2013 Share Posted December 7, 2013 Ford replaced the upper O2 sensor and now the idle is 1200-2000 rpm on starting cold and 1000 rpm on warm start. Also when I start off soon after starting sometimes on pulling off and letting off in city traffic the idle hangs at 2000 rpm. That's a thrilling moment. Anyone have any ideas of the cause or experienced to problem? Thanks Quote Link to comment Share on other sites More sharing options...
YT90SC Posted December 8, 2013 Share Posted December 8, 2013 Check engine lamp on? There may very well be an issue with the throttle body, or maybe a vacuum hose off causing the high idle. If a visual check doesn't show something off, the next step involves a scan tool and watching data to see what is out of whack. IDS has a throttle body check utility that can verify the throttle body operation. Quote Link to comment Share on other sites More sharing options...
socalred Posted December 10, 2013 Author Share Posted December 10, 2013 YT90SC, Thanks for the reply. The check engine light stayed off after the dealer changed the upper O2 sensor. Will be taking the MKT in for oil change soon and will leave it to check this problem. From the replies appears it is not common. Quote Link to comment Share on other sites More sharing options...
socalred Posted December 29, 2013 Author Share Posted December 29, 2013 (edited) Took the MKT in for an oil change and checking the idling issue. Dealer claims the 1200rpm at start in Southern Cal (70 degrees always) is normal. 900 rpm on hot start is normal. Would anyone with a MKT 2012 please respond with your experience on cold (70 degrees) and hot engine start rpm and for how long if above 60rpm. Any tech input would be great. Thanks! socalred Edited December 29, 2013 by socalred Quote Link to comment Share on other sites More sharing options...
akirby Posted December 29, 2013 Share Posted December 29, 2013 High idle is normal on a cold engine - it lights the converter more quickly for better emissions control. Quote Link to comment Share on other sites More sharing options...
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